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Finding the Fourth Proportional to 4,987.74, 7,481.70 and 1,290

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Solution

The fourth proportional to 4,987.74, 7,481.70 and 1,290 is: 1,935.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,987.74 : 7,481.70 = 1,290 : x
  2. Step 2: Convert to fraction form
    4,987.74/7,481.70 = 1,290/x
  3. Step 3: Cross multiply
    4,987.74x = 7,481.70 × 1,290
  4. Step 4: Simplify right side
    4,987.74x = 9,651,393
  5. Step 5: Solve for x
    x = 9,651,393/4,987.74
  6. Step 6: Final answer
    x = 1,935.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.